The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2009
Filed:
Mar. 21, 2006
Gary Hau, Merrimack, NH (US);
Gary Hau, Merrimack, NH (US);
Fairchild Semiconductor Corporation, South Portland, MA (US);
Abstract
A multi-mode RF amplifier is disclosed having high and low output power modes composed of two power paths. When the multi-mode RF amplifier is biased into the high power, HP, mode, substantial power is delivered via both (first and second) paths. While in the low power, LP, mode, power is delivered via second path only which is designed to reduce current consumption and improve efficiency under low power (backoff) operation. The multi-mode RF amplifier has power amplifiers in one embodiment, but no mechanical or electronic switches. The multi-mode amplifier utilizes impedance matching circuits where the impedances change under different power amplifier bias conditions in order to optimize current consumption under both modes of operations and is power efficient for portable applications. Note that, in a preferred embodiment, even in the HP mode more power is delivered to the second power path than to the first power path.